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Related Experiment Videos

Non-invasive electrogastrography. Part 2. Human electrogastrogram

E Atanassova1, I Daskalov, I Dotsinsky

  • 1Institute of Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria.

Archives of Physiology and Biochemistry
|August 1, 1995
PubMed
Summary
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A new method effectively removes cardiac interference from electrogastrograms (EGG), enabling clear visualization of human stomach electrical activity and the migrating myoelectrical complex (MMC). This technique differentiates quiescent and active stomach periods by wave amplitude.

Area of Science:

  • Gastroenterology
  • Biomedical Engineering
  • Physiology

Background:

  • The electrogastrogram (EGG) measures human stomach electrical activity.
  • Cardiac artifacts often contaminate EGG recordings, hindering analysis.
  • Identifying the migrating myoelectrical complex (MMC) is crucial for understanding gastric motility.

Purpose of the Study:

  • To develop and validate a method for eliminating cardiac artifacts from EGG recordings.
  • To characterize the electrical activity of the human stomach during quiescent and active MMC periods.
  • To enable visual identification of MMC in human EGG signals.

Main Methods:

  • Surface electrodes recorded the EGG from the abdominal wall.
  • A novel technique removed QRS complexes (cardiac artifact) by replacing intervals with linear segments.

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  • Low-pass filtering was applied to obtain a high-quality EGG signal.
  • Wave amplitude and frequency were analyzed during different gastric states.

    • Main Results:

    • The cardiac artifact elimination method was successfully implemented.
    • Stomach electrical activity showed distinct frequencies during quiescent (3.35 cpm) and active MMC (2.99 cpm) periods.
    • Wave amplitude significantly differed between quiescent (81.13 microV) and active MMC (164.74 microV) periods.

    Conclusions:

    • The developed method effectively removes cardiac artifacts, yielding high-quality EGG signals.
    • Changes in EGG wave amplitude reliably distinguish between quiescent and active MMC periods in humans.
    • This technique facilitates non-invasive identification of human gastric MMC through visual inspection of EGG.